<template>
  <div>
    <div class="home-page">
      <div class="banner">
        <div class="container">
          <h1 class="logo-font">conduit</h1>
          <p>A place to share your knowledge.</p>
        </div>
      </div>

      <div class="container page">
        <div class="row">
          <div class="col-md-9">
            <div class="feed-toggle">
              <ul class="nav nav-pills outline-active">
                <li class="nav-item" v-if="user">
                  <nuxt-link
                    class="nav-link"
                    exact
                    :class="{ active: tab == 'your_feed' }"
                    :to="{
                      name: 'home',
                      query: {
                        tab: 'your_feed',
                      },
                    }"
                    >Your Feed</nuxt-link
                  >
                </li>
                <li class="nav-item">
                  <nuxt-link
                    class="nav-link"
                    exact
                    :class="{ active: tab == 'global_feed' }"
                    :to="{
                      name: 'home',
                      query: {
                        tab: 'global_feed',
                      },
                    }"
                    >Global Feed</nuxt-link
                  >
                </li>
                <li class="nav-item" v-if="tag">
                  <nuxt-link
                    exact
                    class="nav-link"
                    :class="{ active: tab == 'tab' }"
                    :to="{
                      name: 'home',
                      query: {
                        tab: 'tab',
                        tag: tag,
                      },
                    }"
                    >#{{ tag }}</nuxt-link
                  >
                </li>
              </ul>
            </div>

            <div
              class="article-preview"
              v-for="article in articlesList"
              :key="article.slug"
            >
              <div class="article-meta">
                <nuxt-link
                  :to="{
                    name: 'profile',
                    params: {
                      username: article.author.username,
                    },
                  }"
                >
                  <img :src="article.author.image" />
                </nuxt-link>
                <div class="info">
                  <nuxt-link
                    class="author"
                    :to="{
                      name: 'profile',
                      params: {
                        username: article.author.username,
                      },
                    }"
                  >
                    {{ article.author.username }}
                  </nuxt-link>
                  <span class="date">{{
                    article.createdAt | date("MMM DD, YYYY")
                  }}</span>
                </div>
                <button
                  class="btn btn-outline-primary btn-sm pull-xs-right"
                  :class="{ active: article.favorited }"
                  @click="getStatus(article)"
                  :disabled="article.favoritedDisabled"
                >
                  <i class="ion-heart"></i> {{ article.favoritesCount }}
                </button>
              </div>
              <nuxt-link
                class="preview-link"
                :to="{
                  name: 'article',
                  params: {
                    slug: article.slug,
                  },
                }"
              >
                <h1>{{ article.title }}</h1>
                <p>{{ article.description }}</p>
                <span>Read more...</span>
              </nuxt-link>
            </div>
            <!-- 分页列表 -->
            <nav>
              <ul class="pagination">
                <li
                  class="page-item"
                  :class="{
                    active: item === page,
                  }"
                  v-for="item in totalPage"
                  :key="item"
                >
                  <nuxt-link
                    class="page-link"
                    :to="{
                      name: 'home',
                      query: {
                        page: item,
                      },
                    }"
                    >{{ item }}</nuxt-link
                  >
                </li>
              </ul>
            </nav>
            <!-- /分页列表 -->
          </div>

          <div class="col-md-3">
            <div class="sidebar">
              <p>Popular Tags</p>
              <div class="tag-list">
                <nuxt-link
                  :to="{
                    name: 'home',
                    query: {
                      tag: tag,
                      tab: 'tab',
                    },
                  }"
                  class="tag-pill tag-default"
                  v-for="tag in tags"
                  :key="tag"
                  >{{ tag }}
                </nuxt-link>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { getArticle, getTags ,getYourFeedArticles,addFavorite,deleteFavorite } from "../../http/article";
import { mapState } from "vuex";
export default {
  name: "HomePage",
  async asyncData({ query }) {
    const limit = 30;
    const page = Number.parseInt(query.page || 1);
    const tag = query.tag;
    const tab = query.tab || 'global_feed';
    // getYourFeedArticles
    const getArticles = tab === 'global_feed' ? getArticle : getYourFeedArticles
    const [result1, result2] = await Promise.all([
      getArticles({
        limit,
        offset: (page - 1) * limit,
        tag,
      }),
      // 获取 tags 的接口
      getTags(),
    ]);
    const { articles, articlesCount } = result1.data;
    articles.forEach(element => {
      element.favoritedDisabled = false
    });
    const { tags } = result2.data;
    return {
      articlesCount,
      articlesList: articles,
      limit,
      page,
      tags,
      tag,
      tab,
    };
  },
  watchQuery: ["page", "tag", "tab"],
  computed: {
    ...mapState(["user"]),
    totalPage() {
      return Math.ceil(this.articlesCount / this.limit);
    },
  },
  methods:{
    async getStatus (articles){
      articles.favoritedDisabled = true
      if(articles.favorited){
      await deleteFavorite(articles.slug) 
      articles.favorited = false
      articles.count+=-1
      }else{
        await addFavorite(articles.slug) 
         articles.favorited = true
      articles.count+=1

      }

      articles.favoritedDisabled = false
    }
  }
};
</script>

<style>
</style>